PURPOSE: To provide dot pattern data which is appropriately emphasized by creating dot pattern data for printing, based on a basic dot pattern for each character or mark, data for qualification emphasis degree, and data of trimmer column number.

CONSTITUTION: In an extension dot column number storage means of a printing dot pattern data creating device, an extension dot column number at the time when a character qualification of a bold character is added is set for each one of a plurality of qualification emphasis, degrees and stored. Because of this, dot pattern data for printing is created by a means to create printing data, based on basic dot pattern data for each character or mark, the data for a qualification emphasis degree which is set by an emphasis degree setting means, and data for an extension dot column number which is stored in the extension dot column number storage means. For this reason, depending on the extension dot column number for a bold character qualification, which is set for resepctive qualification emphasis degrees, dot pattern data for bold qualified characters, which is appropriately emphasized while maintaining the quality of characters or marks, can be created.